Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Double-stranded DNA using an entered average base-pair molar mass. Purity and sequence-specific mass differences excluded.
Example Calculation
- DNA mass: 1 ng
- Sequence length: 1000
- Assumed mass per base pair: 660 g/mol/bp
DNA mass = 1; Sequence length = 1000; Assumed mass per base pair = 660. Primary result: 912445569.6969697.
Frequently asked questions
How do I use this calculator?
Enter dna mass, sequence length, assumed mass per base pair. The result updates automatically. Use Reset to restore the example values.
What method does it use?
copies=mass ng ×10⁻⁹ ×N_A /(bp ×mass per bp).. Double-stranded DNA using an entered average base-pair molar mass. Purity and sequence-specific mass differences excluded.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.